Fluid pressure tool



Dec. 15,-1931. I E. w. STEVENS FLUID PRESSURE TOOL Filed June 1, 1928 2 Sheets-Sheet 1 N VEN TOR. Edward WfiEw/zr J o6 WW ATTORNEY.

Dec. 15, 1931. E. w. STEVENS FLUID PRESSURE TOOL Filed June 1, 1928 2 Sheets-Sheet 2 INVENTOR Edward W SfeVens K Mm ATTORNEY.

Fig. 2

lar or other shape;

Patented Dec. 15, 1931 UNITED STATES PATENT OFFICE EDWARD 'W. STEVENS, OF DETROIT, MICHIGAN, ASSIGNOR TO CHICAGO PNEUMATIC TOOL COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY FLUID PRESSURE TOOL Application filed June 1, 1928. Serial-No. 282,144.

This invention relates to power tools of the fluid pressure type. While it has particular adaptation to certain combination tools, such as yoke riveters and is herein disclosed in such relation, it also provides features of more general application.

In using a yoke riveter or other tool whether of a directly similar nature or not, it is frequently the case that thetool must be operated in a restricted space or adjacent obstructions which interfere with the positioning of the tool. This is particularly the case when the power connection or throttle handle is at an angle to the tool. For example, it is frequently desirable to drive rivets in both the right and left sides of the interior of a hollow object which may be of rectangu- If a yoke riveter is used it is necessary that the throttle handle be arranged for swinging movement or other adjustment in order to clear the vertical walls of the object. Any part, however, which swings upon another is apt to become loosened or disengaged and this is particularly the case when applied to a percussive tool by reason of the vibration which results from the operation of the tool.

One object of the invention is to provide an improved swinging or swivel joint for a fluid conduit. Another object is to prevent disengagement or loosening of the parts.

Still another object is to maintain a tight seal .at the joint. Other objects will be apparent from the detailed description which.

follows.

In order to illustrate the invention, one

' line 22 of Fig. 3;

Fig. 3 is an elevational view of the parts shown in Fig. 2 at an angle of rotation of 90 to the right;

Fig. 4 is an elevational view of the swivel head looking into the open end of the same;

compressed air, extends to casing A to sup- 5 Fig. 5 is a rear end elevational view of the tool casing; and

Fig. 6 is a plan view'of the locking ring. The embodiment of the invention chosen for the purpose of illustration comprises a power tool having a hollow casing A within which is mounted for sliding movement a fluid pressure operated riveting hammer B, the casing having secured thereto, either integrally or otherwise, a yoke G. Since the power tool or riveting hammer B forms no part of the present invention, description thereof is omitted. A power conduit, in the present instance for fluid pressure, such as,

ply motor B with operating fluid. The conduit D may include a throttle handle E of any suitable or desired form. The connection of the fluid conduit to casing A so as to. permit free swiveling movement while se 7 curing and maintaining a fluid tight joint as well as the manner of locking the parts against loosening comprise the present invention.

The connection to casing A includesa head 7 having screwthreaded engagement with casing A and a hollow swivel end 8 for conduit D which may be joined directly to the throttle handle E as shown. The swivel end .ther reduced and provided with screw threads as indicated at 8?) thereby providing a shoulder 80, which is engaged by a steel retaining washer 9 held in place by a nut 10. As shown in Figs. 1 and 2,'nut 10 is chamfered, as indicated at 10a, and when the swivel end 8 is assembled upon head 7 reduced extension 8?) is. expanded into the chamfer 10a to rivet the parts together. An

annular enlargement 8d on end 8 is arranged to form an engaging face for the outer end of head 7. Interposed between head 7 and enlargement 8d on the one hand and between the head and bearing washer 9 on the other are packing members or washers 11. These washers, as shown, are counter sunk in head 7, the outer-one partly and the inner one entirely, so that distortion and displacement of the same is effectively prevented. These washers are preferably of rigid, wear resisting, non-metallic material, which will pro vide and maintain a fluid tight seal around swivel end 8. Fibre or a fibrous composition is very satisfactory as a material for washers 11. Bearing washer 10 is keyed to swivel end 8?) in any suitable or desired manner as by a pin 12, Figs. 1 and 2, engaging a slot in the washer whereby relative movement of steel washer 9 and nut 10 is prevented.

With the parts in the swivel connection held in assembled arrangement without an opportunity to become loosened, it is also necessary to make the connection between head 7 and easing A such that the swiveling of conduit D on the head and the vibration incident to the operation of motor B will not cause loosening. The preferred locking arrangement comprises a ring or annulus 13 integral with or integrally secured to casing A somewhat forwardly of its reduced and threaded rear end. In the present instance annulus 13 is threaded upon casing A and then. welded thereto as indicated at. 13a. The rearward portion of annulus 13 is reduced in diameter to form an annular recess 13?) and this reduced portion of the annulus has a number of saw slots 13c, Figs. 2, 3, and 5. The forward portion of head 7 is similarly reduced to form an annular recess.

7?) and the reduced portion is saw-slotted as indicated at 70, Figs. 2, 3, and 4. The saw slots in the reduced portions of annulus l3 and head 7 differ in number to provide a Vernier adjustment, as for example an odd number of slots in annulus 13, such as eleven,

/ and an even number of slots in head 7, such as twelve. When head 7 is screwed upon casing A, it is set up as tightly as possible and turned until one of the slots 13c registers or aligns with one of the slots 70, the large number of slots and their odd and even arrangement with a difference of one permitting a very close adjustment. A locking member is then applied which has a projection extending into the two aligned slot-s.

. By preference the locking member is in the form of a spring ring or clip 14; of a size to encircle the reduced portion 7a and 13]) of head 7 and annulus 13 and to seat the annular groove provided thereby. Ring 14 has one end inturned asindicated at 14a to form a transverse locking projection which extends into the aligned slots; The opposite end of the ring is preferably thinned or dental catching and displacement of the locking ring when the tool is in use.

From the above it will be apparent that adapted for use with fluid pressure percussive tools in that all of the parts are securedly locked against relative movement or loosening regardless of the constant movement of the swivel joint and of the vibration of the tool due to the improved locking arrange ment in the swivel joint itself and in the connection of the swivel head to the tool casing, and that the structure of the swivel joint itself is such as to maintain a fluid-tight connection for an exceptionally long period.

While the invention has been herein disclosed in what is considered to be its preferred form, it is to be understood that the invention is not limited to the specific details thereof but covers all changes, modifications and adaptations within the scope of the appended claim.

conduit comprising a head on said tool having a bore therethrough, a swivel end on said conduit having an extension of a size to pass through the bore in said headand formed reerwardly of said extension with an annular enlargement to engage said head, means in the outer end of said extension to prevent withdrawal from said bore comprising a washer and a nut formed with a chamfer, means keying said washer to said extension, said extension being expanded into the chainfcr of said nut, fibre washers countersunk in said head on opposite sides thereof and engaged by said washer and said enlargement.

Signed by me at Detroit, in the county of Vvayne, and. State of Michigan this 25 day of May, 1928.

EDWARD W. STEVENS.

tapered as indicated at 146 to prevent acciv 'lUi 

